body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #222;
  color: #fff;
}

h1 {
  margin-top: 20px;
}

.game-container {
  display: grid;
  grid-template-columns: repeat(2, 150px);
  grid-gap: 20px;
  justify-content: center;
  margin: 40px auto;
}

.color-button {
  width: 150px;
  height: 150px;
  border-radius: 15px;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.2s;
}

#green { background: #0f0; }
#red { background: #f00; }
#yellow { background: #ff0; }
#blue { background: #00f; }

.color-button.active {
  transform: scale(1.1);
  opacity: 0.7;
}

#start-btn {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  margin-top: 20px;
}

#message {
  margin-top: 20px;
  font-size: 18px;
}
